ASSIGNMENT: Abstract syntax

Using the template for the 3rd assignment, you should write the code for construction of the abstract syntax trees.  Advice: the types, functions and variables that are defined within the same typ, fun and var declaration, respectively, should be represented as a group of declarations distinct from other (groups of) declarations.

You should upload your solution as a zip file named xxxxxxxx-abstr.zip where xxxxxxxx stands for you student identification number.  The contents of the uploaded zip file must have exactly the same directory structure as the template.  The uploaded zip file must contain complete source distribution (including the previous phases), but without antlr and generated files.